# What is the equation for the reaction between calcium hydroxide and sulfuric acid?

$C a {\left(O H\right)}_{2} \left(a q\right) + {H}_{2} S {O}_{4} \left(a q\right) r i g h t \le f t h a r p \infty n s C a S {O}_{4} \left(s\right) \downarrow + 2 {H}_{2} O \left(l\right)$
$C a S {O}_{4} \left(s\right)$ is moderately insoluble, and will precipitate from aqueous solution.